refactor: remove function to provider configs

Author: pxwg

lua/CopilotChat/client.lua

@@ -310,26 +310,20 @@ function Client:ask(opts)
   if opts.model == 'auto' then
     notify.publish(notify.STATUS, 'Auto-selecting model...')
     local provider_name = 'copilot'
-    local headers = self:authenticate(provider_name)
-    local token = headers['Authorization'] and headers['Authorization']:gsub('^Bearer%s+', '')
-
-    local url = 'https://api.individual.githubcopilot.com/models/session'
-    local response, err = curl.post(url, {
-      headers = {
-        ['Authorization'] = 'Bearer ' .. token,
-        ['editor-version'] = 'vscode/1.109.0-insider',
-        ['user-agent'] = 'GitHubCopilotChat/0.38.0',
-        ['x-github-api-version'] = '2025-10-01',
-      },
-      body = { auto_mode = { model_hints = { 'auto' } } },
-      json_response = true,
-      json_request = true,
-    })
+    local provider = self:get_providers():get(provider_name)
+
+    if provider and provider.select_model then
+      local headers = self:authenticate(provider_name)
+      local selected_model, err = provider.select_model(headers, { 'auto' })
 
-    if not err and response and response.status == 200 and response.body.selected_model then
-      opts.model = response.body.selected_model
+      if selected_model then
+        opts.model = selected_model
+      else
+        log.warn('Auto mode failed, falling back to gpt-4o. Error: ' .. tostring(err))
+        opts.model = 'gpt-4o'
+      end
     else
-      log.warn('Auto mode failed, falling back to gpt-4o. Error: ' .. tostring(err or (response and response.status)))
+      log.warn('Auto mode not supported, falling back to gpt-4o')
       opts.model = 'gpt-4o'
     end
   end

lua/CopilotChat/config/providers.lua

@@ -504,6 +504,7 @@ end
 ---@field get_headers nil|fun():table<string, string>,number?
 ---@field get_info nil|fun(headers:table):string[]
 ---@field get_models nil|fun(headers:table):table<CopilotChat.client.Model>
+---@field select_model nil|fun(headers:table, hints:table?):string?,string?
 ---@field prepare_input nil|fun(inputs:table<CopilotChat.client.Message>, opts:CopilotChat.config.providers.Options):table
 ---@field prepare_output nil|fun(output:table, opts:CopilotChat.config.providers.Options):CopilotChat.config.providers.Output
 ---@field get_url nil|fun(opts:CopilotChat.config.providers.Options):string
@@ -512,6 +513,40 @@ end
 local M = {}
 
 M.copilot = {
+  select_model = function(headers, hints)
+    hints = hints or { 'auto' }
+    local token = headers['Authorization'] and headers['Authorization']:gsub('^Bearer%s+', '')
+    if not token then
+      return nil, 'No authorization token available'
+    end
+
+    local url = 'https://api.individual.githubcopilot.com/models/session'
+    local response, err = curl.post(url, {
+      headers = {
+        ['Authorization'] = 'Bearer ' .. token,
+        ['editor-version'] = 'vscode/1.109.0-insider',
+        ['user-agent'] = 'GitHubCopilotChat/0.38.0',
+        ['x-github-api-version'] = '2025-10-01',
+      },
+      body = { auto_mode = { model_hints = hints } },
+      json_response = true,
+      json_request = true,
+    })
+
+    if err then
+      return nil, 'Auto selection request failed: ' .. tostring(err)
+    end
+
+    if not response or response.status ~= 200 then
+      return nil, 'Auto selection returned status: ' .. tostring(response and response.status or 'unknown')
+    end
+
+    if not response.body or not response.body.selected_model then
+      return nil, 'No model selected in response'
+    end
+
+    return response.body.selected_model, nil
+  end,
   get_headers = function()
     local response, err = curl.get('https://api.github.com/copilot_internal/v2/token', {
       json_response = true,